Pioneer AM/FM stereo receiver model
SX-1980. When the SX-1980 was introduced in 1978, it was the most powerful
receiver in the world. It was rated at 270 watts per channel. Everything
about the SX-1980 was on a grand scale, including its price tag that was
$1295.00, making it the most expensive receiver Pioneer had ever built.
Nothing like it had ever been built by Pioneer before, and nothing has been
built like it since. Features, two separate bass and treble controls, tone
on/off which turns off the bass, treble controls, filters 30hz and 8khz,
tape duplicate switch, FM muting on/off FM multipath, Adaptor on/off which allows
you to hook an equalizer up etc. mic left/right inputs, two tape
in/outputs, one aux input, two phono inputs, phono two switch is for both
mic and phono two, phono one cartridge selector, modes stereo and mono, both
tuning and signal meters and both right and left channel power meters plus
other features.

Specifications:

Power Output: 270 watts
per channel RMS into 8 ohms.Harmonic Distortion: Less than 0.03%Intermodulation Distortion: Less than 0.03%